Fuck that. Why is that acceptable? A soundtrack is a basic part of a game. You're so used to paying for extra shit that you forgot that options like those are part of the game that you paid for from non bullshit companies.
Define "actual music". Does it become real music when it's part of a movie sound track? Or when it's played on pop radio stations? When it gets performed by middle schoolers in band classes? When the London Philharmonic performs it? When it reaches Billboard 100? When the artist wins a grammy? Do you need to be in ASCAP to make music? I'm a little confused as to what would differentiate music made for digital entertainment from any other music.
Are you trying to imply that the only way a game music composer can make money is if the game studio sells you their music as dlc? So all the games without dlc soundtracks just got their music off some hobo in an alley and nobody got paid?
They get paid for their work, obviously, but often a significant portion of their ongoing pay is based on soundtrack sales, whether physical or digital.